A plug of mucus that fills the cervical canal during pregnancy. Discharge of the plug is usually followed by rupture of the membranes and progressive labour.
Found on http://www.encyclo.co.uk/local/20415
A small plug of mucus that seals the cervix to protect your baby from infection. During pregnancy, secretions will accumulate and form a mucus plug at the opening of your cervix to protect against infection. The mucus plug will remain at the top of the cervix until just before labor begins. As labor begins, the cervix will begin to thin out and d..... Found on http://www.pregnology.com/Pregnancy-dictionary/